Post Offices List in Jersey County, Illinois:
| Dow Post Office | 24443 Pine St, Dow, IL 62022 |
| Elsah Post Office | 48 MIll St, Elsah, IL 62028 |
| Fidelity Post Office | 304 State St, Fidelity, IL 62030 |
| Fieldon Post Office | 110 E Main St, Fieldon, IL 62031 |
| Grafton Post Office | 419 E Main St, Grafton, IL 62037 |
| Jerseyville Post Office | 115 N Washington St, Jerseyville, IL 62052 |